PHOTOS: Celebrate National Mutt Day with these adorable dogs on Instagram

Every year on July 31 and December 2, we celebrate mixed breed dogs. Animal welfare advocate Colleen Paige started the holiday in 2005. She is also the creator of National Cat Day and National Puppy Day.

National Mutt Day was created to celebrate and raise awareness of the mixed breed dog population.

To learn more about National Mutt Day, visithttp://www.nationalmuttday.com/